不在全局范围内的易于访问的变量

Question

I am building a game with the CreateJS library. In the current build I save a lot of my variables and objects in the Global scope, which is really neat and makes it easy for various extended classes to reuse SpriteSheets etc.

I am looking for a way to NOT use the global scope. Obviously I can pass the spritesheet, or a class which contains the spritesheet as a parameter to all displayobjects I make, but I was hoping there was a more clever way of doing this.

Any suggestions or tips on how to achieve this would be helpful.

Answer 1

You may want to use a module :

var main = (function(){
    var myPrivateVal1 = "Something";
    var myPrivateVal2 = 56;
    var myVeryPrivateVal = 3;

    //Return only what you want to expose
    return {
        myPublicVal: 123,
        getVal1: function(){
            return myPrivateVal1;   
        },
        getVal2: function(){
            return myPrivateVal2;   
        },
        doCalculation: function(){
            return myVeryPrivateVal * myPrivateVal2;
        }
    }
})();

console.log(main.myPublicVal); //123
console.log(main.myPrivateVal1); //undefined
console.log(main.myPrivateVal2); //undefined
console.log(main.myVeryPrivateVal); //undefined

console.log(main.getVal1()); //Something
console.log(main.getVal2()); //56
console.log(main.doCalculation()); //168

Here you have one global variable main , which is the module that exposes what you need to expose, but still keeps track of the variables needed.

See this JSFiddle.